Monthly Schedule: "Fourth" vs "Last" Monday in a Month with 4 Mondays?


Monthly Schedule: "Fourth" vs "Last" Monday in a Month with 4 Mondays?...
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Bill42
Bill42
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I can schedule a monthly backup for the 4th, and I can also schedule one for the last Monday of the month.
This makes sense when a month has 5 Mondays.
But, what happens when a month has only 4 Mondays? The 4th Monday and the last Monday fall on the same day. Will both backups run?
If they will, I guess they could be scheduled at different times, e.g., one at 01:00 and one at 03:00....
Thank you muchly!
..Bill..

jphughan
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Do you WANT multiple backups to run on months that only have 4 Mondays?  If not and you only want monthly backups, then I believe the easiest solution would be to simply schedule your backups to occur on the last Monday of the month, and that task will then run on either the fourth or fifth Monday of the month, depending on the month.  You can avoid using the "4th Monday" option entirely.  You should only need to use both the 4th and Last options in scenarios where you're scheduling weekly backups, since in that case if you didn't use the 4th Monday option, for months with 5 Mondays you'd get no backup on Monday #4.  But that does beg the question of what happens on months with 4 Mondays for someone using weekly backups with all options selected?  My guess is that since it's still a single scheduled task governing that entire schedule, the task will only execute once on Monday #4.

Edited 24 September 2018 4:59 PM by jphughan
Bill42
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jphughan - 24 September 2018 4:54 PM
Do you WANT multiple backups to run on months that only have 4 Mondays?  If not and you only want monthly backups, then I believe the easiest solution would be to simply schedule your backups to occur on the last Monday of the month, and that task will then run on either the fourth or fifth Monday of the month, depending on the month.  You can avoid using the "4th Monday" option entirely.  You should only need to use both the 4th and Last options in scenarios where you're scheduling weekly backups, since in that case if you didn't use the 4th Monday option, for months with 5 Mondays you'd get no backup on Monday #4.  But that does beg the question of what happens on months with 4 Mondays for someone using weekly backups with all options selected?  My guess is that since it's still a single scheduled task governing that entire schedule, the task will only execute once on Monday #4.

Thank you very much!

I missed a significant point about this backup schedule. It's to run early every Monday morning, with a full backup on the 1st Monday of the month, and an incremental on the other Mondays of the month.
Thanks again!

PS: As came to me when writing my original post, I could schedule the 4th Monday for 01:00 and the last Monday for 04:00 (which leaves lots of time for the 01:00 bkup to finish). If both bkups run when a 4th Monday is also a last Monday, the latter backup would be quick an small.

Edited 24 September 2018 6:06 PM by Bill42
jphughan
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Ah ok, if you're running both monthly and weekly backups of different types, this actually gets even easier.  Here's what you'd do:

- Schedule your weekly Incremental backups to run on the 1st through 4th Mondays at the desired time of day.
- Schedule your monthly Full backup to run on the Last Monday at the same time of day as above.

In this scenario, for months with four Mondays, the Incremental and Full will be scheduled to run at the same time on the same day, and Reflect itself is designed to handle this.  For cases where different backup types are requested at the same time and all requested backups come from the same definition file, Reflect only runs the "highest order" backup -- so a Full would override a Diff, which would override an Incremental.  It does this because this type of scheduling conflict is pretty common in backup strategies, e.g. daily Incrementals, weekly Differentials, and monthly Fulls.

If you actually WANT to get one of each backup on these types of days, then if you want the second backup to be quick and small, the Incremental would have to occur AFTER the Full.  In your scenario above, the Incremental is scheduled first, which doesn't result in either backup being quick or small, because the Incremental will be a normal size, and the Full will always be the same size regardless of what backups happened right before it.  By comparison, if you scheduled the Full first and the Incremental shortly thereafter, then the Incremental would indeed be quick and small because it would only have to capture changes that occurred since the last Full.  But again, I think the best overall strategy is to design your schedule so that only one backup occurs on those days, and in that setup it will always be the Full, which presumably is what you'd want. Smile

Bill42
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This is perfect!!
Many thanks! Kiss BigGrin
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