>>>In the past I used to save files to my computer that started to slow it down.
I guess your hard disk storage usage was too high, and a lot of files were fragmented. Using DriveHQ Online Backup, you can automatically backup those files to DriveHQ cloud storage. However, we usually don't recommend deleting your local files. It is ok to delete source files after they have been backed up. DriveHQ Online Backup does not delete files backed up on server even if the source files have been deleted.
If you really want to delete local (source) files, then it is better to use DriveHQ FileManager. You can drag and drop files/folders to DriveHQ using FileManager. You can also double click on a remote file, edit it; after finished, just click on Save to save the file. It will be saved to a local cache folder and then automatically sync-ed to DriveHQ remote storage.