For many years, Greg used the channel to immediately re-upload videos he deleted from his UhOhBro and Speaks channels. In 2013 Greg described this as: "Where all classic Onision videos come to live out the rest of their lives :)" (Source)
Before the Adpocolypse, many speculated he did this to squeeze out more views and ad-revenue from videos whose view count plateaued. It was is also rumored that whenever Greg would receive backlash from people whose pictures he used in videos, he would move the video to his Archive channel to get them off his trail. Although, any instance of this happening could have just been a coincidence since he moves videos to the channel quite frequently.
After the Adpocolypse, he most likely uploaded videos to Archive that were demonetized on other channels.
On September 14, 2018, Greg announced the end of the channel with the video "Goodbye To OnisionArchive". The video was a short video telling fans to go to Onision, Speaks, and UhOhBro. ($ource) This was the same video uploaded to Character Vlogs and OnisionEncore.
|UhOhBro||Active (2012-)||2.1m subs|
|Onision||Active (2006-)||2m subs|
|OnisionSpeaks||Active (2009-)||1.7m subs|
|OnisionArchive||Discontinued (2008-2018)||586k subs|
|OnisionEncore||Discontinued (2011-2018)||166k subs|
(prev. Onion Son)
|Discontinued (2017)||88k subs|
|Onichan||Discontinued (2017-2018)||52k subs|
(prev. Oni Chan)
|Active (2017-)||26k subs|
|New Channel||Discontinued (2018)||19k subs|
|Character Vlogs||Discontinued (2018)||4k subs|
|Comment Cranks||Discontinued (2017)||1k subs|
|Crovati||Discontinued (2012)||900 subs|
|OnisionTrolls||Discontinued (2012)||500 subs|
|Vaitavious||Deleted (2012)||30 subs|