Mambo is a free photo/video backup assistant that helps you to keep your memories backed up to your SmugMug account.
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Trusted by users in 130+ countries.
No, converting your videos isn't typically needed unless you're having issues with the format, codec, or the size of the video. SmugMug recommends you to try uploading your video or a small sample to see if you have any problems before any editing or formatting.
If you do find any issue, convert your video. SmugMug recommends a .mov file with the h.264 video codec. Audio should be AAC 128kbps (stereo or mono only, no surround sound).