I am running debian 9 on my vps. Filesystem is ext3.

I have cron jobs which drop database dumps into a dropbox folder.

In addition I have created some shared folders so that non techies can upload material.

However Dropbox are dropping support for ext3 this will be broken soon.

What's my best option here. 

Migrate the entire VPS to ext4?

Create a new (ext4) partition? 

Something else.

I note from https://debian-administration.org/article/643/Migrating_a_live_system_from_ext3_to_ext4_filesystem that it is possible to switch from ext3 to ext4 without any conversion by simply editing the fstab and rebooting. 

Does anyone know if that will suffice for Dropbox's new requirements? I suspect not. :(