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Can I use 2 destination drives for backup?

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I have scheduled a differential backup with the following settings:
a. create full version after 10 differential versions
b. store no more than 4 recent version chains
c. do not delete the first version of the backup.

My full backups are about 1.5TB and the differentials range between 05.GB - 90GB.

My destination disc now does not have enough room for a second version chain and the schedule full backup did not run. I have a second drive that I can use for backups, but I am not sure whether to:

1. Cut back the recent version chains to store 2 chains and try to set-up the backup process to run across 2 destination drives (is that even possible?) or

2. Create two Backup schemes, each with a different destination drive, and then manually alternate between them.

Please advise

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Understand that
full plus 10 differential is chain length = 11 files.

Keep 4 chains is 44 backups (4 x 11)

Keep original is 1 keep first full always

So before any deletions of old backups occur, you will be creating 4 chains (44 files) plus Original full plus replacment Full

Do you have room for 3 fulls plus 40 differentials before the deletion occurs?????

I have room for 3 fulls plus 20 differentials ( 1 + 11+ 11) across two 4TB drives (2 keep chains). I know that I will have to reduce the # of keep chains from 4 to 2. What I don't know is how to modify the backup process to use 2 destination drives.

If both 4TB drive will remain attached permanently to your PC preferably installed internally it is possible to create a spanned volume across both drives using Windows Diskpart utility making it appear to Windows and any installed applications that the created volume is 1 drive having 1 drive letter. A spanned volume creates a dynamic disk and is not fault tolerant which is something you would need to consider in doing this. If this is something you want to consider here is a link that should be of benefit:

https://technet.microsoft.com/en-us/library/cc772180.aspx

Review this entry from Grover http://forum.acronis.com/forum/64634