allow admin to set retention period of deleted items for one drive business
the retention period for primary and secondary recycle bin should be configurable by user, i.e. should a policy want to reduce retention to be less than the current default 30 or 93 days
Guillermo Rosemberg commented
If you allow admins to set custom retention time for deleted items, small business could simply config no deletion at all and use Sharepoint/Document_Libraries or OneDrive for Business as final storage location, without the need to look for a specific backup solution.
Small businesses grow at a slow pace and in general the most of their work is carried on specific software management applications, being the storage of files a support or byproduct activity. If I only need 10GiB and the ability to change de retention policy, I can have 990 GiB between first and second stage Recycle Bin. By the time we consume that capacity, years would been passed. It's a worthy tradeoff, because it simplify the backup scheme of the business and centralize all the storage management in OneDrive. I know it's not the ideal solution but can be useful.
Greg Frye commented
I have a similar need. I understand the reasoning given via a tech support ticket - -related to the difficulty/impossibility of restoring an item deleted from the OneDrive trash bin, but feel this is short-sighted on Microsoft’s part because of the varied ways in which users can use the technology vs. the one way in which Microsoft designers think it would be used. Even PowerShell scripting features would be of benefit for automating management of the OneDrive trash bin for those admins that may need to do so. Retention period for items deleted and in the recycle bin needs to be configurable all the way down to 1 or 0 days. In our case, we don't need the recoverability because we can recover on in-house on-prem via another method. OneDrive is only used as a sync vehicle for certain users and not the primary/final storage location.