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Trouble with incremental

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I am trying to set up a reoccuring incremental backup and have two problems.
I am backing up to external drives I have three acessablee. I do not have them running all the time. Therefore, drive letter assignments fluctuate and by incremental backups fail because a drive like f: is not available.

What is best practice in keeping drive letter assignments straight wihout having to turn all drives on?

I also tried to modify my incremental backup to place the backup on a different drive. I also wanted to change it to a monthly instead of daily. However, when I edit the backup settings and try and save it, I get error cant find backup set. Should I delete and start over?

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Keep in mind that without the matching full, an incremental is useless.

My suggestion would be this.

Use Windows Disk Management and reletter the external drives to X and Y and Z. Also add their unique names such asn their size or brand. Up to 11 characters.
For example: one of mine is X-640_X  another is V1T-V

Set up 3 tasks. Each task pointing to a different disk.
You can schedule the tasks or you may prefer to use the included desktop shortcut option and run the tasks manually from the 3 easily identified desktop shortcuts.

Each disk would have its own full backups plus its own incrementals.

The first week, you would put in disk X and run the task associated with disk X.Full plus incrementals. Chain 1.
The second week, you would put in dixk y and run he task associated with disk y. Full plus incrementals. Chain 2.
etc.

You can attach any external you wish and run that task whenever just be sure and run the task associated with that drive letter--such as by choosing the right desktop shortcut.

One suggestion on backup scheme below. Adjust the 6 and 4 to your needs.

Sounds like a great plan and I will impliment. Thanks a lot. You state to "adjust 6 and 4 to your needs". What is 6?

6 appears within the red 3 above in post #1.
In this illustration, 6 is the number of incremental backups to be created before a new full is created.

4 appears within the red 5 above

In this illustration, 4 is the number of backup chains to be retained before chains start being deleted just like a department store escalator. The oldest chain is deleted after a new replacement is added.

Chain=1 full plus whatever number of incrmentals within the chain. Each new full backup starts a new chain.