Backing up a large host daily

Hello,
I am using Acronis cloud to backup a large shared files area of a host. Unfortunately the files are generated by several software systems automatically and some of them drop literally thousands of small files into single subfolders. This has created a problem because the backup cannot complete in a day and for policy reasons we need to back it up daily.
When using a local backup solution we could work around this issue by creating a volume image backup which did not run into problems for attempting to parse the file system of the shared area.
Is there a way to do something similar with Acronis Cloud Backup, or is there another solution that could eb applied to this problem ?
NOTES:
The entire host is not backed up only a shared content area.
A file based solution is preferred because it helps improve retention capability, but if it is not possible volume backup is suficcient.
Any ideas ?

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