An initial Seed Backup is used when the data that you need to backup is just too big for conventional internet connections.
If you are not sure whether you need Initial Seeding, you can check the approximate data transfer table:
|Internet connection speed||100 MB||1 GB||10 GB|
|500 kbps||36 min||336 min||3330 min|
|1 Mbps||20 min||170 min||1670 min|
|5 Mbps||6 min||36 min||336 min|
|10 Mbps||5 min||20 min||170 min|
To check your internet connection speed, visit https://www.speedtest.net and use the guide above to estimate your upload time.
Incremental backups are incredibly efficient and only take a few minutes to complete hereafter.