Hi,
just a suggestion:
Use the SeaDrive client and rsnapshot (Linux, GitHub - rsnapshot/rsnapshot: a tool for backing up your data using rsync (if you want to get help, use https://lists.sourceforge.net/lists/listinfo/rsnapshot-discuss)) or HardlinkBackup (Windows, GitHub - linuzer/HardlinkBackup: Simple, but robust rotating file Backup using NTFS-Hardlinks) to actually sync the files to the laptop. Both programs will make periodically snapshots of all available files and using hardlinks, so no unnecessary storage space is used.
Here an excerpt of my rsnapshot configuration:
snapshot_root /data/rsnapshot/
backup /var/www/
retain hourly 6
retain daily 7
retain weekly 4
retain monthly 3
snapshot_root will point to the directory provided by the SeaDrive client and backup to a local directory on your laptop.
Deleted files will only be deleted in the latest snapshot and will stay accessible in older ones. If you adjust the number of daily snapshots you will get a quite reliable backup.
If you installed Linux on your laptop it alternatively might be worth to have a look at burp (http://burp.grke.org/).
Best regards
Thomas